Drill bit insert

Details Drill bit insert Drill bit insert

1978-10-05

1981-03-10

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

E21C 1300

Patent

active

042548403

ABSTRACT:
A protruding insert for use in an oil well drill bit is disclosed which insert is made of a hard metal substance and utilizes a tangential spherical surface having opposed flattened sides.

REFERENCES:
patent: 3442342 (1969-05-01), McElya et al.
patent: 3542142 (1970-11-01), Hasiba
patent: 3599737 (1971-08-01), Fisher
patent: 4047583 (1977-09-01), Dyer
patent: 4058177 (1977-11-01), Langford, Jr. et al.
patent: 4086973 (1978-04-01), Keller et al.

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